Microbiology: An Introduction
Microbiology: An Introduction
11th Edition
ISBN: 9780321733603
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: Benjamin Cummings
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Chapter 20, Problem 6A

The following results were obtained from a broth dilution test for microbial susceptibility.

Antibiotic Concentration Growth Growth in Subculture
200 µg/ml  -  -
100 µg/ml  - +
50 µg/ml + +
25 µg/ml + +

a. The MIC of this antibiotic is _______.

b. The MBC of this antibiotic is _______.

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1. a. Disk A b. Disk B   c. Disk C   d. Disk D   2.  a. Strip A with MIC at 0.25 μg/mL b. Strip B with MIC at 0.064 μg/mL c. Strip C with MIC at 0.075 μg/mL d. All of the strips show equal antimicrobial efficacy
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